The processing of thin-walled deep-hole parts is difficult, especially the processing of high-precision sleeves is more difficult. Our company has a sleeve part as shown in Figure 1. The design requirements are strict, the processing precision is high, and the early stage of product development is processed by external processing. There are many problems, which can not meet the needs of normal operation of the product. The company decided to make it.
1 Process analysis
The sleeve is a high-speed rotating part with a maximum speed of nearly 20,000r/min. The design requires extremely strict dynamic balance and the dynamic balance level is G1. The smaller the coaxiality between the outer circle and each stepped hole, the better, preferably within 0.01. The part number is an integral structure, the stepped hole is a deep hole, the deepest hole is nearly 900 mm, and the aspect ratio is close to 13 mm. In the deep hole cutting, the vibration, the difficulty of the knife and the chip removal, and the difficulty in heat dissipation make the processing difficult, and it is also difficult to measure the coaxiality of the deep hole, the deep hole and the outer circle.
Due to the overall structure, the rough material is round steel, and the weight of the blank before processing is 127kg. After processing, only 20kg is left, which is less than one sixth of the original weight. A large amount of metal is cut off, so the deformation is severe.
2 Process measures
In response to the above problems, when formulating the processing technology, the following measures are taken.
Multiple heat treatments are used to eliminate machining stress and deformation.
After several attempts to improve the process, the thin-wall deep-hole high-precision sleeve processing was successful. After the test run to meet the design requirements.
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